Some parts of your body become gradually less sensitive.
On their way to your brain, the nerves meet several skin folds and each one reduces the nervous transmission.
You can find out how folded an area is by passing your nail on it and mapping its sensitivity.

The skin in the folded sections may become as hard and insensitive as wood.

In the center of these unresponsive areas, you will find one or more fold crossings.

When the folding occurs at an articulation, it can stop nervous transmission from reaching entire members.

Folds in the hand, wrist, elbow, shoulder, ankle, knee and hip areas can bend and entwine the neurons and provoke a gradual loss of perception.

Symptoms may start a slight insensibility in the extremities, but the affected area will grow.

The folds responsible for this situation were caused by a repeated physical activity or position.

You must determine which of your actions create the folds and, if you can, stop doing them temporarily or change the way you do them.

As you groom the articulations, you will feel the sensitivity returning to the regions beyond it.

Folds in the skin cut off the sensibility of entire sections of the body; legs, arms and even the torso.

Symptoms may start with occasional periods of light insensitivity, but may lead to almost complete paralysis, often accompanied by involuntary nervous shaking or gestures.

Nerves are well protected inside the spinal cord and the skull, but they become vulnerable in the neck area.

This zone is very susceptible to folding because of the weight of the head and the length and the rotation of the neck.

When your head is turned or when your sleeping position is angled, large folds cut deeply into the flesh.

Large folds in the back of the head, neck, nuque and upper back areas can have a very disabling effect on some people.

Grooming to re-establish sensitivity to one part of the body differs from the usual procedure.

Working on the affected region won't do much good.

You first want to locate the place where transmission is blocked, then groom it.

Press your nail along the path followed by the nerves, but insist on articulations and the neck area.

When you groom and press your nail into the spot where the nerves are pinched, you will briefly feel sensibility returning to the dull regions.

Use this information to pinpoint the blockage and groom it until sensitivity is restored.

Calluses are rough, thickened patches of skin with reduced sensitivity.

They may have an outer layer of dead skin, but the thickening is due to folds.

These areas are often subjected to excessive wear and tear along with prolonged pressure.

Never sand or file them; groom them.

You will have to put extra strength on your nails to get through.

Somewhere in all the hardness, you will find spots with abnormal sensitivity; very little or too much.

Put pressure on those places, these are the fold crossings you want to crush.

Nervous disorders usually develop gradually during a life time.
Grooming the affected areas may provoke unknown reactions.
Be smart and go gradually.
One thing is sure; if you find the right spots, you will know it right away.
You will feel flashes of sensitivity coming from the dead or numb areas.
Groom for short periods, several times a day, until the original sensibility is restored.